CANNES -- The riots were Wednesday. Kinski was Thursday. Relative calm returned by the weekend. But it is safe to say that few entrances in the history of the Cannes Film Festival have rivaled the reception of Nastassja Kinski when she arrived here for the premiere of her latest film, the luridly stylistic "The Moon in the Gutter." The film was not a success, but Kinski was a triumph -- not because of her performance, but because of herself. Has there ever been an actress in the history of the cinema who has so fascinated so many people without yet having appeared in a single truly great movie?